Rotary valve for explosion-engines.



H. E. COPPIN & G. G. BEHN.

ROTARY VALVE FOR EXPLOSION ENGINES.

APPLICATION FILED JUNE27,'1910. 1,034,877, Patented Aug. 6, 1912.

UNITED STATES PATENT OFFICE.

HOWARD E. COFFIN AND GUIDO' G. BEHN, OF DETROIT, MlTCHIGAN, ASSIGNORS,BY

HESNE ASSIGNMENTS, TO THE REYNOLDS MOTOR COMPANY, OF DETROIT, MICH-IGAN, A CORPORATION or MICHIGAN.

. ROTARY VALVE FOR EXPLOSION-ENGINES.

LO SLSW.

T 0 all whom it may concern:

Be it known that we, HOWARD E. Corrm and GUIDO G. Bums, citizens of theUnited States of America, residing at Detroitfiln the county of \Vayneand State of Michigan, have invented certain new and useful Improvementsin Rotary Valves for Explosion- Engines, of which the"following is aspecification, reference being had therein to the accompanying drawings.

The invention relates to rotary valves of the disk type, and it is theobject of the invention to avoid leakage, particularly that occurringbetween the port and the periphcry of the disk. \Vhere valves of thischaracter are used in connection with explosion engines, the seal of thevalve upon its seat is effected by a liquid packing introducedtherebetween; usually a lubricating oil. This will prevent leakage ofthe compression gases across the face of the seat in its wider portions,but it has been fou d that more or less leakage does occur ac ss thecomparatively narrow strip separating the port from the periphery of thedisk. This difficulty we have avoided in the present construction by theemployment of an annular packing outside of the port in the valve diskand preferably engaging a groove in the periphery of the disk.

In the drawings-Figure 1 is a central section through the enginecylinder to which our valve is applied showing the valve partly insection. Fig. 2 is a plan view looking upward, showing the valve partlyin sect-ion.

A is a cylinder of an explosion engine which has a valve seat B formedon the inner face of the cylinder head, C is a rotary disk valve mountedupon a rotary stem D which passes out through a journal bearing E in thehead, F is a port through the valve disk which may area and is adaptedto register with a, cooperating port in the head (not shown).

To seal the valve a fluid packing is introduced between the seat andface. This is preferably fed between the surfaces near the center sothat a centrifugal force caused by the rotation of the valve will assistin forcing the lubricant outward toward the periphery. As shown, G is achannel extending radially in. the head to the bearing Specification ofLetters Patent.

Application filed June 27, 191.0.

be of any desired shape or' Patent-ed Aug. 6, 1912. Serial No. 569.064.

scribed in use, the pressure produced by the propels it. in op explosionwithin the cylinder will tend to.

force the film of lubricant backward from the periphery toward thecenter. The frictional resistance of the entire film extending betweenthe periphery and. valve stem is too great to be thus overcome, but thefilm between the periphery and the port may be blown out which willcause a leakage of the gases and interfere with the successful operationof the engine. e therefore provide in the construction illustrated, apacking ring I which engages a groove J in the periphery of the disk,the outer face of said ring bearing against the wall K of the cylinder.The ring I is constructed to spring outwardkand a clearance ispreferably provided to permit the gas pressure fronithe cylinder toreach .the under face of the ring thereby holding the latter in ll'lllcontact with the cylinder. Thus as shown, channels L are formed in thering communicating with the groove, and the lower edge of the ring isalso preferably chainferod at M shown.

In operation the ring I in connection with the lubricant will form aseal that cannot be broken by the gaseous pressure within the cylinder.If desired, the ring may be caused to rotate with the disk by suitablecouplings. but preferably such connection is not employed andconsequently the friction between the periphery of the ring and thecylinder will hold the former tatiorauv. However, the disk is free torevolve and the seal is just as effective as would he the case if thering were revolving wieh the disk.

What we claim as our invention is:

1. The combination with a rotary disk valve having a port in the arethereof, of a seat for said valve. and u non-rotating packing ringengaging said valve outside of the port.

of said valve.

2. The combination with a rotary ,disk

valve having a'port in the face thereof, of a seat for said valve, and anon-rotating ring engagin the periphery of the valve.

3. In com nation with a rotary disk valve having a port in the facethereof, a seat for said valve, and a non-rotating packing ring engaginga groove in the periphery ,4; In combination with an engine cylinder,and the head thereof, of a rotary valve seated against the head of saidcylinder, and a non-rotating packing ring engaging v the periphery ofsaid valve.

5. The combination with an engine cylinder and the head thereof, of arotary disk valve seated against the head of said cylinder, and anon-rotating packing ring engaging a peripheral groove in said valve andbearing against the wall of the cylinder.

In testimony whereof we aflix our signatures in presence of twowitnesses.

HOWARD COFFIN. GUIDO G. BEHN.

Witnesses LENA M. CABLE, ETHEL J. ESSIG.

